<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2015 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: yunwuxin <448901948@qq.com>
// +----------------------------------------------------------------------
namespace think\image\gif;
class Encoder
{
public $GIF = "GIF89a"; /* GIF header 6 bytes */
public $VER = "GIFEncoder V2.05"; /* Encoder version */
public $BUF = [];
public $LOP = 0;
public $DIS = 2;
public $COL = -1;
public $IMG = -1;
public $ERR = [
'ERR00' => "Does not supported function for only one image!",
'ERR01' => "Source is not a GIF image!",
'ERR02' => "Unintelligible flag ",
'ERR03' => "Does not make animation from animated GIF source",
];
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFEncoder...
::
*/
public function __construct(
$GIF_src, $GIF_dly, $GIF_lop, $GIF_dis,
$GIF_red, $GIF_grn, $GIF_blu, $GIF_mod
)
{
if (!is_array($GIF_src)) {
printf("%s: %s", $this->VER, $this->ERR['ERR00']);
exit(0);
}
$this->LOP = ($GIF_lop > -1) ? $GIF_lop : 0;
$this->DIS = ($GIF_dis > -1) ? (($GIF_dis < 3) ? $GIF_dis : 3) : 2;
$this->COL = ($GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1) ?
($GIF_red | ($GIF_grn << 8) | ($GIF_blu << 16)) : -1;
for ($i = 0; $i < count($GIF_src); $i++) {
if (strtolower($GIF_mod) == "url") {
$this->BUF[] = fread(fopen($GIF_src[$i], "rb"), filesize($GIF_src[$i]));
} else if (strtolower($GIF_mod) == "bin") {
$this->BUF[] = $GIF_src[$i];
} else {
printf("%s: %s ( %s )!", $this->VER, $this->ERR['ERR02'], $GIF_mod);
exit(0);
}
if (substr($this->BUF[$i], 0, 6) != "GIF87a" && substr($this->BUF[$i], 0, 6) != "GIF89a") {
printf("%s: %d %s", $this->VER, $i, $this->ERR['ERR01']);
exit(0);
}
for ($j = (13 + 3 * (2 << (ord($this->BUF[$i]{10}) & 0x07))), $k = true; $k; $j++) {
switch ($this->BUF[$i]{$j}) {
case "!":
if ((substr($this->BUF[$i], ($j + 3), 8)) == "NETSCAPE") {
printf("%s: %s ( %s source )!", $this->VER, $this->ERR['ERR03'], ($i + 1));
exit(0);
}
break;
case ";":
$k = false;
break;
}
}
}
$this->addHeader();
for ($i = 0; $i < count($this->BUF); $i++) {
$this->addFrames($i, $GIF_dly[$i]);
}
$this->addFooter();
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFAddHeader...
::
*/
public function addHeader()
{
if (ord($this->BUF[0]{10}) & 0x80) {
$cmap = 3 * (2 << (ord($this->BUF[0]{10}) & 0x07));
$this->GIF .= substr($this->BUF[0], 6, 7);
$this->GIF .= substr($this->BUF[0], 13, $cmap);
$this->GIF .= "!\377\13NETSCAPE2.0\3\1" . $this->word($this->LOP) . "\0";
}
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFAddFrames...
::
*/
public function addFrames($i, $d)
{
$Locals_img = '';
$Locals_str = 13 + 3 * (2 << (ord($this->BUF[$i]{10}) & 0x07));
$Locals_end = strlen($this->BUF[$i]) - $Locals_str - 1;
$Locals_tmp = substr($this->BUF[$i], $Locals_str, $Locals_end);
$Global_len = 2 << (ord($this->BUF[0]{10}) & 0x07);
$Locals_len = 2 << (ord($this->BUF[$i]{10}) & 0x07);
$Global_rgb = substr($this->BUF[0], 13,
3 * (2 << (ord($this->BUF[0]{10}) & 0x07)));
$Locals_rgb = substr($this->BUF[$i], 13,
3 * (2 << (ord($this->BUF[$i]{10}) & 0x07)));
$Locals_ext = "!\xF9\x04" . chr(($this->DIS << 2) + 0) .
chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . "\x0\x0";
if ($this->COL > -1 && ord($this->BUF[$i]{10}) & 0x80) {
for ($j = 0; $j < (2 << (ord($this->BUF[$i]{10}) & 0x07)); $j++) {
if (
ord($Locals_rgb{3 * $j + 0}) == (($this->COL >> 16) & 0xFF) &&
ord($Locals_rgb{3 * $j + 1}) == (($this->COL >> 8) & 0xFF) &&
ord($Locals_rgb{3 * $j + 2}) == (($this->COL >> 0) & 0xFF)
) {
$Locals_ext = "!\xF9\x04" . chr(($this->DIS << 2) + 1) .
chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . chr($j) . "\x0";
break;
}
}
}
switch ($Locals_tmp{0}) {
case "!":
/**
* @var string $Locals_img ;
*/
$Locals_img = substr($Locals_tmp, 8, 10);
$Locals_tmp = substr($Locals_tmp, 18, strlen($Locals_tmp) - 18);
break;
case ",":
$Locals_img = substr($Locals_tmp, 0, 10);
$Locals_tmp = substr($Locals_tmp, 10, strlen($Locals_tmp) - 10);
break;
}
if (ord($this->BUF[$i]{10}) & 0x80 && $this->IMG > -1) {
if ($Global_len == $Locals_len) {
if ($this->blockCompare($Global_rgb, $Locals_rgb, $Global_len)) {
$this->GIF .= ($Locals_ext . $Locals_img . $Locals_tmp);
} else {
$byte = ord($Locals_img{9});
$byte |= 0x80;
$byte &= 0xF8;
$byte |= (ord($this->BUF[0]{10}) & 0x07);
$Locals_img{9} = chr($byte);
$this->GIF .= ($Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp);
}
} else {
$byte = ord($Locals_img{9});
$byte |= 0x80;
$byte &= 0xF8;
$byte |= (ord($this->BUF[$i]{10}) & 0x07);
$Locals_img{9} = chr($byte);
$this->GIF .= ($Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp);
}
} else {
$this->GIF .= ($Locals_ext . $Locals_img . $Locals_tmp);
}
$this->IMG = 1;
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFAddFooter...
::
*/
public function addFooter()
{
$this->GIF .= ";";
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFBlockCompare...
::
*/
public function blockCompare($GlobalBlock, $LocalBlock, $Len)
{
for ($i = 0; $i < $Len; $i++) {
if (
$GlobalBlock{3 * $i + 0} != $LocalBlock{3 * $i + 0} ||
$GlobalBlock{3 * $i + 1} != $LocalBlock{3 * $i + 1} ||
$GlobalBlock{3 * $i + 2} != $LocalBlock{3 * $i + 2}
) {
return (0);
}
}
return (1);
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GIFWord...
::
*/
public function word($int)
{
return (chr($int & 0xFF) . chr(($int >> 8) & 0xFF));
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: GetAnimation...
::
*/
public function getAnimation()
{
return ($this->GIF);
}
}